ASN Wikibase Occurrence # 150880
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| Date: | Thursday 1 November 1984 |
| Time: | 11:24 LT |
| Type: |  Sikorsky S-76A |
| Owner/operator: | Petroleum Helicopters, op. for China Ocean Helicopters |
| Registration: | N27422 |
| MSN: | 760139 |
| Fatalities: | Fatalities: 5 / Occupants: 5 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Gulf of Tonkin, off Hainan Island -
 China
|
| Phase: | Initial climb |
| Nature: | Offshore |
| Departure airport: | Oil Rig No 4 |
The helicopter crashed into the sea two minutes after takeoff because of dual engine shutdown. It sank rapidly, killing the five occupants.
Joint investigation by China and USA determined that the Sikorsky's left engine suffered an uncontained failure owing to mechanical fault. However, the right engine was shut down by the crew. The crew also did not deploy the emergency float system, which was found to be operable and could have saved the lives. There were no clear answers to these mistakes of the crew because the helicopter's CVR malfunctioned.
Sources:
https://www.sohu.com/a/439541839_120712229
WAAS
ICAO Accident Digest 1984 / no 31
People's Daily. 1985-04-13. page 4. (in Chinese)
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 26-Nov-2012 04:09 | TB | Added |
| 31-Jan-2013 08:16 | TB | Updated [Narrative] |
| 25-Feb-2013 06:51 | TB | Updated [Narrative] |
| 28-Feb-2013 11:58 | TB | Updated [Operator, Narrative] |
| 28-Sep-2014 20:36 | Aerossurance | Updated [Time, Registration, Cn, Phase, Nature, Departure airport, Destination airport, Source, Narrative] |
| 18-Sep-2023 09:28 | RDV | Updated [[Time, Registration, Cn, Phase, Nature, Departure airport, Destination airport, Source, Narrative]] |
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